package com.itheima.interceptor;


import com.alibaba.fastjson.JSONObject;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Slf4j
@Component
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override   //目标资源方法运行前运行  true放行  false不放行
    public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception {
        System.out.println("preHandle...");


        //获取url
        String url = req.getRequestURL().toString();
        log.info("请求的url,{}", url);


        //是登录操作
        if(url.contains("login")){
            log.info("登录操作");
            return true;    //提前放行
        }

        //获取请求头的令牌 token
        String jwt = req.getHeader("token");

        //令牌不存在 返回错误信息
        if(!StringUtils.hasLength(jwt)){
            log.info("解析令牌失败，返回未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            //手动转换 对象---->json
            String notLogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);  //返回错误信息
            return false;
        }


        //解析token 如果解析失败 返回错误结果
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) { //解析失败
            e.printStackTrace();
            log.info("解析令牌失败，返回未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            //手动转换 对象---->json
            String notLogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);   //返回错误信息
            return false;
        }

        //放行
        log.info("令牌合法");
        return true;
    }

    @Override  //资源方法运行后运行
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle... ");
    }

    @Override //试图渲染完毕后运行 最后运行
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion...");
    }
}
